Perry



w. w PERRY SHEET CLAMPING MEANS FOR PRINTING DEVICE March 3, 1964 Filed Aug. 15, 1961 INTOR.

A TTORNEYS 3,l23,dl Patented Mar. 3, 1964 lice FIG. 2 is an enlarged fragmentary perspective view of I one of the rolls or the device shown in FIG. 1 illustratin HF f AM? J REA T b S ga i in deta1l the nnproved clamping means of the invention;

Wilson W. Perry, Box 625, firm-ch, Va.

FIG. 3 is a section substantially on line 33 of Filed Aug. 15, 1961, $21. No. 131,52? 5 5 Cl i ((31, 1o3 415,j FIG. 4 is a fragmentary end view of the clamping device of the present invention with a web clamped be- This invention relates to improvements in printing or tween the clamping bar and the trailing surface of a roll duplicating devices and particularl to sheet clamping groove; and means for rolls of printing and duplicating machines. 5 is a if y P P View Oi: a Inedified It is a principal object of the invention to provide imform of the invention wherein the bearing blocks for proved clamping means for printing duplicating mathe clamping device adjustably carry sheet stop means. chine rolls which is simple in construction, positive in Referring to the drawings and, in particular, to FIG. 1 operation and relatively inexpensive to manufacture thereof, i l generally designates a duplicating machine thereby obtaining maximum efhciency with a minimum p ying th lnpr vcd Clamping means of the present f expense d i t invention and comprises an impression roll or cylinder Another object of the present invention is to provide a 1 a blanket cylinder or roll l4 having a blanket 16 clamping device for rolls of a printing or duplicating about the generally cylindrical surface thereof. The machine that may be advantageously employed on master lanket roll 14 is provided with a groove 18 in the cycylinders and/or blanket rolls of offset pri .ing devices. 20 lindri al Surface thereof with the improved clamping A further object of the present invention is to promeans 29 of the invention mounted adjacent the trailing vide such a device that is readily adaptable to be re edge 22 of the groove l8. ceived on substantially any grooved plate or blanket re- T e assembly also includes a cylinder roll 24 having cgiving roll of duplicating 11315 3 11163 and is readily admounted thereon a master Slflfifit 01'. plate 26. The plate justed to accommodate various thicknesses of master 25 foil 0 cylinder 24 is provided with a groove 28 formed h t d/ blanket& in the cylindrical surface thereof, which groove is similar A further objects of the present invention is to provide in nstruction to the groove 18 of roll 14. such a clamping device wherein an entire end of a master T groo e 2 of roll 2% is provided with the imsheet or blanket is securely and snugly clamped to its proved clamping device of the present invention generally cooperating roll substantially eliminating torn master 30 igna d 2% for maintaining the master sheet o late sheets and blankets often occurrin with clamping de- 25 n aid I011. The Clamping device 243' is mounted advices engaging only portions of ends of master sheets and ja ni th trailing edge 3% of the groove 28, blankets. The duplicating machine also includes suitable water A f th bj t i t id an i d clamping applying means generally designated 32. and including a device for rolls of duplicating machines wherein cen- Water f llfi a follfiiain TOii a dueief foil a trifugal force and/ or friction between cooperating rolls metal OSeiiiEliOf 4i} and a form Oiiei ail 35 9011111191113 which would normally tend to urge master sheets and known in the art. The duplicating machine iii further blankets out of clamping engagement with their rggpec includes an inking SYSiBIll 44- comprising an ink fOUIltive rolls increases the frictional engagement between the min a fountain You a dUCiOY I011 a disil'i'ollioi clamping device and the material being clamped on the roll 52, an osci lator roll 54, ink forming roll sets 56 and respective 11 58, and a further oscillator roll 6%}.

These and other objects and advantages of the pres- In operation of the duplicating device illustrated in ent invention are provided in a printing device including fa master sheet or plate with indicia thereon is a master and a blanket I011 having grooves extgnding provided with ink and water flOlll ilk": inl: and water longitudinally across the cylindrical surfaces thereof, an 45 y m 32 and 44 which ink is transferred to the blanket impression roll operatively aligned i h th master d i6 securely secured to the blanket roll or cylinder 14 and blanket rolls and means for directing to the outer the transferred in}; is then deposited on a Sheet of P y surface of the master roll, the combinations consisting 218 he paper passes through the nip between the blanket of means for securing a web or sheet of material to said roll and the impression roll or cylinder 12. A substantial master and blanket rolls comprising a bar, said bar havpressure is required between the various ink and water ing cylindrical end portions and between said cylindrical PP l T0115, Contacting h T 11 rf ce Of the plate end portions said bar being generally quadrangular in cylinder 24- 211111 a relatively high pressure is maintained transverse cross section, a pair of bearing blocks adapted at t nip tw n the blanket roll 1 and the master to receive the cylindrical end portions of said bar, means Sheet carrying roll 24. In view of these substantial presmounting one of said pair of bearing blocks in the grooves sures, it is necessary to securely clamp the leading ends of said rolls adjacent each end of the groove to posiof the master sheet and the blanket to the trailing edges tion a planar face of said bar in parallel spaced relation of the grooves provided in the plate cylinder and blanket to the trailing edge of the grooves in said respective rolls, cylinder to immobilize the master sheet and blanket sheet and handle means secured to said bar for p oting said bar during operation of the duplicating device. about the bearing blocks to a sheet recei g and remov- Referring to FIGS. 2, 3 and 4 of the drawings, details ing position and to a position wherein a radially inner of the improved clamping device as applied to the plate edge of said planar face of the bar urges an end of the cylinder or roll 24 is illustrated in detail, with lir e strucsheet into clamping engagement with said trailing edge tures being provided with identical reference characters of the roll grooves. employed in describing the structures in FIG. 1.

Other objects and advantages of the present invention In FIG. 2, the master sheet roll 24 is illustrated as will be apparent to those skilled in the art from the being of the type wherein the groove 2% extends across following detailed description of the present invention the cylindrical surface 6d completely on end as while when considered in light of the accompanying drawings it terminates short of the opposite end 68. However, wherein: it will be appreciated by those skilled in the art that the FIG. 1 is a diagrammatic sectional view of a conven- 7O groove 28 may extend to both ends 6% and 68 or may tional offset type duplicating machine having rolls provided with the novel clamping means of the invention;

terminate short of both ends without departing from the scope of the present invention.

The groove 2i; has a leading edge 7% and a trailing edge 30. Adjacent the trailing edge are mounted a pair of bearing blocks 72 and 72'. Each of the bearing blocks 72 and 72' is provided with an elongated slot 74 extending centrally therethrough which elongated slots are adapted to receive fastening means such as bolts '76 which threadedly engage the bottom surface '78 of the groove 23 securing each of the bearing blocks in its predetermined position.

Further, the bearing blocks are bored as at Si? to receive cylindrical ends 82 of the clamping bar 2%, Whereby the bar may be rotated about the axis of the cylindrical ends 82. Between these cylindrical ends 32, the clamping bar may be quadrangular in cross section as more clearly illustrated in FIG. 3. However, it is necessary that the bar have one quadrangular face 3 and a cooperating lower edge in order to insure simple insertion and removal of the sheet and positive clamping of the sheet to the roll. One of the quadrangular faces 3 is mounted in spaced parallel relationship to the trailing edge 31} of the groove .28 with the spacing between the face 84 and the surface 3% of the groove 28 being so selected that the leading edge of the particular master sheet may be freely inserted between the face 84 and the face 3% when the face 84 is generally in a plane parallel to the face 30 of the groove 2%.

The clamping assembly also includes a manual actuating lever 86 illustrated as a cylindrical bar, one end of which is securely received in a cooperating bore in face 88 of the clamping rod 62. It will be noted that the face 88 is the face parallel to the face 84 previously described.

The extended end 99 of the manual actuating bar 86 may be bored to receive end 92 of a tension spring 94 While the opposite end as of the spring is secured by bolt means ht; to the base of the groove 28 in the roll whereby the handle 86 and the clamping bar 62 are urged by the spring 94 into a clamping position. The urging of the spring aids in preventing the handle from pivoting upwardly during high-speed actuation of the duplicating machine.

Referring again to FIG. 3 of the drawings, the handle 86 is manually urged in the direction of the directional arrow 1% when the leading end of the master sheet is being inserted or removed from between face 84 of the clamping bar 62 and face 36 of the groove 28. With the master sheet in position, the handle is released and the spring 94 urges the handle in the opposite direction to the directional arrow 1% which urges edge 192 of the bar 62 into contact with the outer surface of the master sheet 26 which, in turn, urges the inner face of the master sheet into engagement with the trailing edge 31) of the groove 28 securely clam ing the master sheet on the master roll. As illustrated, edge N2 may be slightly rounded to prevent the clamping force of the edge from cutting the master sheet during clamping thereof.

it will be particularly noted that any force tending to urge the leading edge of the master sheet as from its clamped position will increase the clamping force provided by the edge 192 of the bar 62, thus insuring positive anchoring of the leading edge of said sheet 25.

While the foregoing invention has been primarily described with reference to the master sheet roll of a duplicating machine as hereinbefore discussed, a similar clamp may advantageously be employed to secure the blanket 16 to the blanket roll 3.4 as illustrated at 23 in FIG. 1 of the drawings.

Further, in the illustrated forms of the invention, a single clamping device is employed adjacent the trailing edge of the respective grooves of the master and blanket rolls whereby the trailing ends of the blanket and the master sheet are unconnected to their respective rolls. Where desired, a similar clamping device may be employed adjacent the leading edges of the respective grooves of said rolls whereby the trailing edge of the attached master sheets and blankets may also be anchored.

Referring to FIG. 5 of the drawings, there is shown a modified form of the present invention wherein the bearing bl cks for the rod are provided with stop means for the sheet to be clamped to the roll. in FIG. 5, each of the bearing blocks 72' has adjustably secured thereto member 119 having a foot portion or stop member 112.

In the illustrated form of the invention, member 11%) is' slotted as at lid and limited vertical movement of the member relative to its bearing block is provided by loosening the clamping screws 118.

Where desired, cooperating indicia may be provided on the member 116 and the bearing block as shown at 114 to permit accurate relative adjustment of the pair of members 119.

Through the use of the stop members lit the operator may simply and accurately place master sheets on the master roll in serial succession. Further, with the improved stop member, a master sheet may be canted a predetermined amount by placing one stop member at a different height relative to its companion stop member.

From the foregoing description of the present invention, it will be appreciated that various modifications may be made in the form of the improved clamping device without departing from the spirit of the present invention as defined in the following claims.

I claim:

1. In a printing device including a roll having a groove extending longitudinally across the cylindrical surface thereof and means cooperating with a wall of said groove for clamping a sheet to the cylindrical surface of the roll comprisin a bar, said bar having at least one rectangular face and a cooperating clamping edge, said clamping edge being continuous and substanially coextensive with the wall of the groove, cylindrical end portions for said bar, a pair of bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said pair of bearing blocks in the groove of the roll adjacent each end of the groove to position said one face of said bar in parallel spaced relation to the trailing edge of the groove, and handle means secured to said bar for pivoting said bar about the bearing blocks to a sheet receiving and removing position and a position wherein a clamping edge of the said one face of the bar secures an end of the sheet in clamping engagement with said trailing edge of the roll groove, and a stop member adjustably carried by each of said hearing blocks.

2. In a printing device including a roll having a groove extending longitudinally across the cylindrical surface thereof and means cooperating with a wall of said groove for clamping a sheet to the cylindrical surface of the roll comprising a bar, said bar having cylindrical end portions and between said cylindrical end portions said bar being generally quadrangular in transverse cross section, a pair of bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said pair of bearing blocks in the groove of the roll adjacent each end of the groove to position a planar face'of said bar in parallel spaced relation to the trailing edge of the groove, handle means secured to said bar for pivoting said bar about the bearing blocks to a sheet receiving and removing position and a position wherein a radial inner edge of the said planar face of the bar secures an end of the sheet in clamping engagement with said trailing edge of the roll groove and resilient means connected to said roll and said handle means for urging said radial inner edge of said bar into clamping engagement with said end of the sheet, said radial inner edge being continuous and substantially coextensive with the trailing edge of the roll groove.

3. In a printing device including a master roll having a groove extending longitudinally across the cylindrical surface thereof, an impression roll operatively aligned with the master roll and means for directing ink to the outer surface of the master roll; the combination conisting of means for securing a master sheet to said master roll comprising a bar, said bar having cylindrical end portions and between said cylindrical end portions said bar being generally quadrangular in transverse cross section, a pair of bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said pair of bearing blocks in the groove of the master roll adjacent each end of the roove to position a planar face of said bar in parallel spaced relation to the trailing edge of the groove, handle means secured to said bar for pivoting said bar about the bearing blocks to a master sheet receiving and removing position and a position wherein a radial inner edge of said planar face of the bar urges an end of the master sheet into clamping engagement with said trailing edge of the master roll groove, and resilient means normally urging said handle means and said bar to a position wherein said radial inner edge is in contact with said master sheet, said radial inner edge being continuous and substantially coextensive with the trailing edge of the roll groove.

4. In a printing device inclining a master roll, an impression roll operatively aligned with the master roll and having a groove extending longitudinally across the cyindrical surface thereof, means for direct ng ink to the outer surface of the master roll; the combination consisting of means for securing a blanket sheet to said blanket roll comprising a bar, said bar having cylindrical end portions and between said cylindrical end portions said bar being generally quadrangular in transverse cross section, a pair of bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said pair of bearing blocks in the groove of the blanket roll adjacent each end of the groove to position a planar face of said bar in paralle spaced relation to the trailing edge of the groove, handle means secured to said bar for pivoting said bar about the bearing blocks to a blanket sheet receiving and removing position and a position wherein a radially inner edge of said planar face of the bar urges an end of the blanket sheet into clarnping engagement with said trailing edge of the roll groove, said radial inner edge being continuous and substantially coextensive with the trailing edge of the roll groove, and resilient means normally urging said radial inner edge of said bar into engagement with the blanket sheet.

5. in a printing device including a master roll, a blankct roll, and an impression roll, all operatively aligned, a groove extending longitudinally across the cylindrical surface of said master roll and said blanket roll, the combination consisting of means for securing a sheet to said master roll and to said blanket roll comprising a bar, said bar having cylindrical end portions and between said cylindrical end portions said bar being generally quadrangular in transverse cross section, bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said bearing blocks to the groove of the master roll and the blanket roll adjacent each end or" said grooves to position a planar face of said bar in parallel spaced relationship to the trailing edge of each of said grooves, handle means secured to each of said bars for pivoting said bars about the bearing blocks to a sheet receiving and removing position and a position wherein a radial inner edge of said planar face of each of said bars urges an end of said sheet into clamping engagement with the trailing edges of each of said roll grooves, and resilient means normally urging the radial inner edge of each of said bars into clamping engagement with th ir respective sheets, the said radial inner edge of each of said bars being continuous and substantially coextensive with the respective trailing edges of each of said roll grooves.

6. In a printing device including a roll having a groove extending longitudinally across the cylindrical surface thereof and means cooperating with a wall of said groove for clamping a sheet to the cyl ndrical surface of the roll comprising a bar, said bar having cylindrical end portions and between said cylindrical end portions said bar having a planar face, said planar face defining at least one longitudinal edge therealong, said longitudinal edge being radially spaced from said cylindrical surface, a pair of bearing blocks adapted to receive the cylindrical end portions of said bar, means mounting one of said pair of bearing blocks in the groove of the roll adjacent each end of the groove to position said planar face of said bar in parallel spaced relation to the trailing edge of the groove, handle means secured to said bar for pivoting said bar about the bearing blocks to a sheet receiving and removing position and a position wherein said longitudinal edge of the said planar face of the bar secures an end of the sheet in clamping engagement with said trailing edge of the roll groove with the longitudinal edge making line contact with the end of the sheet, the planar face being out of parallelism with the trailing edge of the groove when the line contact is made and resilient means connected to said roll and said handle means for urging said longitudinal edge of said bar into clamping engagement with said end of the sheet, said longitudinal edge being continuous and substantially coextensive with the trailing edge of the roll groove.

Reierences Cited in the file of this patent UNITED STATES PATENTS 1,853,208 Harrold Apr. 12, 1932 1,954,550 Weide Apr. 10, 1934 2,051,511 Finch Aug. 18, 1936 2,309,161 Breman et a1, Jan. 26, 1943 2,861,862 Zecha et a1. Nov. 25, 1958 

1. IN A PRINTING DEVICE INCLUDING A ROLL HAVING A GROOVE EXTENDING LONGITUDINALLY ACROSS THE CYLINDRICAL SURFACE THEREOF AND MEANS COOPERATING WITH A WALL OF SAID GROOVE FOR CLAMPING A SHEET TO THE CYLINDRICAL SURFACE OF THE ROLL COMPRISING A BAR, SAID BAR HAVING AT LEAST ONE RECTANGULAR FACE AND A COOPERATING CLAMPING EDGE, SAID CLAMPING EDGE BEING CONTINUOUS AND SUBSTANIALLY COEXTENSIVE WITH THE WALL OF THE GROOVE, CYLINDRICAL END PORTIONS FOR SAID BAR, A PAIR OF BEARING BLOCKS ADAPTED TO RECEIVE THE CYLINDRICAL END PORTIONS OF SAID BAR, MEANS MOUNTING ONE OF SAID PAIR OF BEARING BLOCKS IN THE GROOVE OF THE ROLL ADJACENT EACH END OF THE GROOVE TO POSITION SAID ONE FACE OF SAID BAR IN PARALLEL SPACED RELATION TO THE TRAILING EDGE OF THE GROOVE, AND HANDLE MEANS SECURED TO SAID BAR FOR PIVOTING SAID BAR ABOUT THE BEARING BLOCKS TO A SHEET RECEIVING AND REMOVING POSITION AND A POSITION WHEREIN A CLAMPING EDGE OF THE SAID ONE FACE OF THE BAR SECURES AN END OF THE SHEET IN CLAMPING ENGAGEMENT WITH SAID TRAILING EDGE OF THE ROLL GROOVE, AND A STOP MEMBER ADJUSTABLY CARRIED BY EACH OF SAID BEARING BLOCKS. 